EP3400155A2

EP3400155A2 - Noise damper for a compressed air system of a vehicle, in particular a utility vehicle

Info

Publication number: EP3400155A2
Application number: EP16819083.3A
Authority: EP
Inventors: Isa AYDEMIR
Original assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Current assignee: Knorr Bremse Systeme fuer Nutzfahrzeuge GmbH
Priority date: 2016-01-05
Filing date: 2016-12-21
Publication date: 2018-11-14
Anticipated expiration: 2036-12-21
Also published as: EP3400155B1; DE102016100140A1; CN108883760A; WO2017118577A2; WO2017118577A3; RU2702280C1

Abstract

The present invention relates to a noise damper (10) for a compressed air system of a vehicle, in particular a utility vehicle, comprising a housing (12), at least one air inlet (22) and at least one air outlet (54) as well as a labyrinth-like insulation structure (48) arranged in the housing (12).

Description

DESCRIPTION

Silencer for a compressed air system of a vehicle, in particular a commercial vehicle

The present invention relates to a silencer for a compressed air system of a vehicle, in particular a commercial vehicle.

Silencers for compressed air systems of vehicles, especially commercial vehicles are already known from the prior art, the housing and a

Insulation include. The housing has an air inlet and an air outlet, and the insulation means is disposed within the housing.

Such silencers are used in particular for noise reduction of

Air treatment systems for the braking system of a commercial vehicle, such as a truck used.

The noise attenuation is achieved in particular by the fact that the air from the

Air inlet is flowed through the insulation to the air outlet.

These silencers are particularly suitable for an application in which the noise in compressed air systems, which arise when venting the compressed air system, can be reduced. Such noise dampers are known in particular from EP 0 565 136 A2, EP 0 596 220 B1 and DE 10 2009 052 884 A1.

Furthermore, WO 2008/138465 A2 discloses a silencer for damping the outflow noise of compressed air from compressed air devices of commercial vehicles which have a spirally arranged filter fabric inside the silencer. From EP 0 132 696 A2 a noise damper for valve assemblies in compressed air systems of commercial vehicles is known, which is below a

Soundproof insert has a structure with guide ribs leading to the air outlet. Furthermore, from WO 2009/152884 A2 a silencer for

Compressed air systems known by vehicles, several in the interior

having projecting webs for mounting an insulating material.

Another noise damper for compressed air systems of vehicles is known from EP 0 019 855 A1.

Furthermore, DE 29 04 529 A1 discloses a noise damper for

Compressed air systems of a vehicle and the DE 19701361 a silencer for valve assemblies in compressed air systems for commercial vehicles, which has a bypass channel and a secondary outlet, can escape through the air when the

Soundproofing material added.

Furthermore, a sound damping device for an air drying system of an air pressure supply system for a commercial vehicle is disclosed in WO 2013/026763 A1, wherein a heating rod is provided in the interior of the sound damping device in order to prevent freezing and clogging due to frozen condensate of the muffler.

In the previously known noise dampers there is also the danger of so-called dead spaces. These dead spaces in the insulation are not flowed through by the air. This greatly reduces the noise attenuation efficiency.

Furthermore, in a Druckluftentlüftungseinrichtung not be ruled out that after prolonged operation, the compressed air permeability of the noise-damping means inside the housing, such as knitted fabric or the like subsides, for example, by freezing of the condensate or carbon deposits. This can lead to a higher dynamic pressure inside the silencer. It is therefore an object of the present invention to develop a noise damper of the type mentioned in an advantageous manner, in particular

to the extent that this at lower cost greater robustness against

Damage caused by clogging of the insulating material.

This object is achieved by a noise damper with the features of claim 1. Thereafter, it is provided that a noise damper for a compressed air system of a vehicle, in particular a commercial vehicle is provided, wherein the silencer comprises a housing, at least one air inlet and at least one air outlet and a housing arranged in the labyrinthine Dämmstruktur.

The invention is based on the basic idea that the insulating material or the air guide arranged in the interior of the housing is such that the

Silencer is essentially dead space free. By no to slight

Using insulating means, the air flowing through the muffler must take a longer flow path, which is achieved by several deflections. The deflections are made in particular by the in the housing

arranged labyrinthine insulating structure. By such a structure, a very homogeneous flow through the noise damper can be ensured, which minimizes the dead space and maximizes the insulating capacity per insulator used. At the same time, a smaller proportion of insulating material is possible, which is the

Silencer compared to the previously known approaches clearly

makes it cheaper.

Furthermore, it can be provided that the air inlet is arranged axially and the air outlet radially with respect to the longitudinal axis of the housing. This makes it possible to ensure a flow of the noise damper with air through initially an axially disposed outlet through the center of the muffler of the noise damper, after which the inflowing compressed air must flow radially outward through the labyrinth. As a result, the first is already done automatically

Deflection, which has a longer flow path and to a

Slowing the flow rate of the noise damper flowing fluid, in particular allows the noise damper to flow through the compressed air.

The housing may be formed in two parts with at least one upper housing part and with at least one lower housing part. This makes it possible to make the noise damper overall easy. This design of the

Noise suppressor also makes it possible to easily arrange a labyrinthine insulation structure in the housing. It can be provided that the upper housing part has at least one substantially completely radially encircling housing upper rib and that the

Housing base at least one substantially completely circumferential

Has housing lower rib. This housing sub-ribs in the upper housing part and lower housing part also allow a deflection of the fluid flowing through the noise damper, in particular the compressed air flowing through the silencer and also serve to slow down the flow velocity of this fluid or the compressed air. The housing top rib and the

Housing bottom rib thus participate in the sound attenuation and can

be an integral part of the labyrinthine Dämmstruktur.

In particular, it can be provided that the housing upper rib and the

Housing lower rib are arranged offset radially to each other. It is conceivable, in particular, that the housing upper rib and the lower housing rib engage in one another. In particular, it is thereby possible that by merely nesting the upper housing part with the lower housing part by the nesting

Housing upper ribs a labyrinth-like insulating structure is formed, wherein the air flow between the housing upper ribs is guided zigzag. This leads to an easy-to-implement deflection of the flowing fluids or the flowing compressed air, since a longer flow path with very many

Deflections is guaranteed. This leads to a significant reduction in the

Flow rate. Further, such a structure makes it possible to reduce the cross section of the flow path, whereby the fluid is less or less does not find any dead spaces that remain unused. The flow path continues to flow very homogeneously.

In particular, it can be provided that the housing upper rib and the

Housing bottom rib essentially form the labyrinthine Dämmstruktur.

Furthermore, it can be provided that the upper housing part and the

Interlock housing base. In particular, it is conceivable in this context that between two

Housing bottom ribs engages an upper housing rib or between two

Housing upper ribs engages a lower housing rib.

In addition, it can be provided that a pressure relief valve unit is provided. With such a pressure relief valve unit can be ensured that when clogging of the noise damper and when reaching a high back pressure, a possibly resulting pressure in the silencer on the

Relief valve unit can be removed. In particular, it is conceivable that the pressure relief valve unit operates non-destructive and reversible.

Furthermore, it can be provided that an inflow space is provided on the inlet side and that the overpressure valve unit, the air inlet and the labyrinthine

Insulating structure are connected to the inflow space. This allows a compact design and easy-to-implement structure of the noise damper can be realized.

It can be provided that in the interior of the noise damper insulation is arranged.

The insulation means can here before a diameter extension, e.g. one

Intermediate channel inside the noise damper, to the inside of the

Heated silencer facing end to be pressed with the input nominal width of the air inlet. The incoming air through the air inlet therefore enters directly into the insulation, and even before it flows into the intermediate channel.

Further details and advantages of the invention will now be explained in more detail with reference to an embodiment shown in the drawings.

Show it:

1 shows a silencer in a schematic sectional view in a first embodiment;

2 shows a silencer in a schematic sectional illustration in a second embodiment;

3 shows a silencer in a schematic sectional view in a third embodiment;

4 shows a silencer in a schematic sectional view in a fourth embodiment;

5 shows a silencer in a schematic sectional view in a fifth embodiment;

6 shows a silencer in a schematic sectional representation in a sixth embodiment; and

7 shows a silencer in a schematic sectional representation in a seventh embodiment;

Fig. 1 shows a schematic sectional view of a first embodiment according to the invention of a noise damper 10 for a compressed air system of a vehicle, here a commercial vehicle.

The silencer 10 is a silencer that is used in conjunction with the air conditioning system of a pneumatic brake system of a commercial vehicle. The noise damper 10 has a multi-part housing 12, which consists of a housing cover 14, a housing outer pot 16 and a housing insert 18, which forms an upper housing part 18. The housing cover 14 has at its one end an attachment piece 20 in which the air inlet 22 of the noise damper 10 is arranged.

The air inlet 22 leads to a diameter broadening in the housing cover 14, wherein the diameter broadening in combination with the housing upper part 18 forms an inflow space 24.

In the inflow space 24 a plurality of guide ribs 26 are provided.

Furthermore, in the region of the inflow space 24, a radially outward one

Overpressure valve unit 28 is provided.

The pressure relief valve unit 28 consists of a housing receptacle 30, in which a pressure relief valve opening 32 is provided, which is connected directly to the inflow space 24.

The relief valve device 32 is closed by a spring-loaded ball 34 which is spring loaded by a spring 36 in the normal operating condition (as shown in FIG. 1). The housing receptacle 30 in turn faces the outside of the

Housing cover 14 toward an insert 38, in which the Überdruckventilauslassöffnung 40 is formed.

The insert 38 is inserted into the housing receptacle 30 to define the diameter of the relief valve outlet 40 accordingly. The upper housing part 18 is in the assembled state of the noise damper 10 in the interior, which is formed by the housing cover 14 and the housing outer pot 16. The upper housing part 18 has on its side facing the housing cover 14 a funnel-shaped structure, namely a cup-shaped projection 42, which forms a kind of intermediate channel. On the in the assembled state of the noise damper 10 the air inlet 22 side facing a collar 44 is further provided, which extends radially outwardly from the intermediate channel 42 ago. The collar 44 is pulled to the inside of the wall of the housing outer pot 16.

On the side facing away from the collar 44 of the intermediate channel 42, a plurality of air outlet openings 46 is provided at the end of the intermediate channel 42.

These air outlet openings 46 connect the intermediate channel 42 with the

labyrinthine insulating structure 48.

The labyrinthine insulating structure 48 is formed on the one hand by the outside of the intermediate channel 42 of the upper housing part 18, a plurality of parallel to this

Exterior wall rising housing lower ribs 50 and also paralle to

Outer wall of the intermediate channel 42 and displaced from the lower housing ribs 50 extending upper housing ribs 52. The upper housing ribs 52 and the lower housing ribs 50 are arranged radially offset from each other and engage each other, so that the upper housing part 18 and

Housing base engage with each other.

The flow path from the openings 46 through the lower housing ribs 50 and the upper housing ribs 52 thus runs zigzag and with several

Deflections.

Radially outboard of the housing outer pot 16 are at the end of the

Gehäuseaußentopfs 16, which faces away from the housing cover 14, the air outlets 54 of the noise damper 10 is provided. The noise damper 10 thus has an axial air inlet 22 and a radial air outlet 54 with respect to the longitudinal axis of the housing 12 of the noise damper 10. Between the upper housing ribs 52 and lower housing ribs 50 may

Be provided insulation. In addition, insulating material can be provided in the cup-shaped projection 42. However, this is not mandatory.

The function of the noise damper 10 can be described as follows:

Air enters the noise damper 10 via the air inlet 22 and first flows into the inflow space 24, where it passes through the guide ribs 26 and the collar 44 of the

Housing upper part 18 is directed toward the intermediate channel 42. There, the air flows through the openings 46 in the labyrinthine insulating structure 48 and is redirected there several times by means of the housing upper ribs 52 and the housing bottom ribs 50 until it reaches the air outlets 54.

Due to the multiple deflection, the flow velocity of the guided through the labyrinthine insulating structure 48 air is significantly reduced, which is why it comes to a sound attenuation. This leads to a noise reduction.

In a case where due to, for example, frozen condensate or residues of oil carbon residues in the flow path between the air inlet 22 and the air outlets 54 at least partially present blockages, an overpressure on the pressure relief valve unit 28 can be reduced without this ireversible change of the pressure relief valve unit 28 takes place. The back pressure, which must be achieved, can be adjusted here in particular via the spring 36. If the adjacent dynamic pressure is so great that the ball 34 is pressed back against the spring 36, the opening 32 is opened and the compressed air can escape via the pressure relief valve opening 32 and the outlet 40.

The exemplary embodiment shown in FIG. 1 is thus a noise damper 10 with forced air guidance through the labyrinthine insulating structure 48 additional insulation material and one laterally (radially) arranged

Pressure relief valve unit 28.

Fig. 2 shows a second embodiment according to the invention a

Noise absorber 1 10.

The noise damper 1 10 has substantially all structural and functional features, as is the case with the noise damper 10 described above in connection with the one described in Fig. 1.

However, there are the following differences, which will be briefly explained below:

The noise damper 1 10 shown in Fig. 2 is a silencer 1 10 with positively-directed air duct with or without insulating material and without one

Pressure relief valve unit, which is connected to the inflow space.

Instead, the pressure relief valve unit 128 is disposed at the air inlet opposite end of the intermediate channel 142.

Furthermore, the lower housing part 1 16a, which has the lower housing ribs 150, not an integral part of the housing pot 1 16, but designed as a separate component. The guide 130 for the pressure relief valve unit 128 is formed in the lower housing part 1 16a.

The housing pot 1 16 has on its radial outer surface a plurality of air outlets 154 with a comparatively large cross section or diameter, in particular in comparison to the air outlets 154.

The Gehäuseaußentopf 1 16 further has in its lower part a guide 1 16b for the receptacle 130. In this area 16b Überdruckluftauslassöffnungen 130a and 16c are provided both in the receptacle 130 and in the guide.

In the area of the air inlet 122, following the air inlet 122 and the transition to the inflow space 124, a coarse screen 123 is provided, through which the air flowing through the air inlet 122, which continues to flow to the inflow space 124, first has to pass.

3 shows a schematic sectional view of a further exemplary embodiment according to the invention of a noise damper 210 which is constructed comparable to the noise damper 110 shown in FIG. 2, in particular in connection with the embodiment of the overpressure valve unit 228.

The muffler 210 is a forcibly muffled muffler 210

Air duct with or without insulating material and a centrally arranged

Pressure relief valve unit 228.

The noise damper 210 has substantially all structural and functional features, such as the silencers shown in FIGS. 1 and 2. However, the following differences exist in particular:

In contrast to the silencer 1 10 shown in Fig. 2, the

Noise suppressor 210 no separate housing lower part, because here are as in the embodiment shown in Fig. 1, the housing lower ribs 250 in

Housing pot 216 arranged.

The housing pot 216 is substantially identical to the housing pot 16 according to the embodiment as shown in FIG. 1, but with the difference that here a guide 216 a is provided, in which the pressure relief valve unit 228 is performed. Furthermore, here in the region of the air inlet 222, a nozzle-like structure 223 is provided which serves to direct the inflowing air flow via the air inlet 222 directly into the intermediate channel 242. Fig. 4 shows a schematic sectional view of a further inventive

Embodiment of a noise damper 310.

The silencer 310 is also a silencer 310 with forcibly directed air duct with or without insulating material and here with a laterally arranged pressure relief valve unit 328th

The overpressure valve unit 328 is arranged here on the housing cover 314 and consists of an overpressure valve stub 328a, outlet openings 328b and a rubber sleeve 328c arranged above the overpressure valve stub 328a.

3, a nozzle-like structure 323 is also provided here in the region of the inlet 322, which connects the air inlet 322 with the intermediate channel 342 such that the fluid flowing through the air inlet 322, in particular compressed air, substantially directly into the intermediate channel 342 is directed.

The exemplary embodiment according to FIG. 4 relating to the silencer 310 is substantially identical structurally and functionally as the exemplary embodiment according to FIG. 3 with regard to the silencer 210. Significant differences exist only in connection with the overpressure valve unit 328 and the design of the housing pot 216. since this no guide 216a must have for a centrally located pressure relief valve unit.

The function of the overpressure valve unit 328 is such that in the case of too high a back pressure, the rubber boot 328c lifts off in such a way that air can escape via the outlet opening 328b and as a result the overpressure can be reduced.

Fig. 5 also shows a schematic sectional view of another

Embodiment of a noise damper 410 according to the invention. The muffler 410 is a forcibly muffled noise muffler 410

Air duct with or without insulating material and with a centrally arranged

Relief valve unit 428, which corresponds in terms of their construction and operation of the pressure relief valve unit 328 according to the embodiment of FIG. 4.

The difference of the noise damper 410, which essentially corresponds in function to the exemplary embodiments according to FIGS. 3 and 4, is that the

Relief valve unit 428 is not arranged laterally and in the housing cover, as in the silencer 310 of FIG. 4, but also centrally, as is the case in the embodiment of FIG. 3 concerning the noise damper 210.

The pressure relief valve unit 428 is thus disposed at the end of the intermediate passage 442, which is opposite to the air inlet 422.

FIGS. 6 and 7 show further exemplary embodiments of noise dampers 510 and 610, which in principle can be implemented with all the embodiments shown in FIGS. 1 to 5. In the case of the silencers 510 and 610, it is explicitly shown in each case how insulating means 543 and 643 are arranged in the intermediate channel 542 and 642, respectively.

In the embodiment shown in FIG. 6, the nozzle 523 dips into the insulating means 543. The insulating material 543 is here before the diameter extension of the interior of the fume damper facing the end with the input nominal width of the

Air inlet pressed.

The incoming air through the air inlet therefore enters directly into the insulating means 543, and even before it flows into the intermediate channel. In the embodiment shown in Fig. 7, the insulating means 643 is sealed by the outer diameter and also dips the nozzle 623 in the insulation means 643 a. In principle, it can be provided that a high back pressure is prevented in all the embodiments shown in that an overpressure valve is designed in the form of a ball with a spring or as a U-ring or as a Sombrero or in combination. This prevents that after a long period of operation of the insulation means a high back pressure arises when the compressed air permeability of the insulation decreases.

In all muffler concepts, it is further possible that is sealed radially on the already small outer diameter of the knitted fabric and so the

Dynamic pressure only a significantly reduced effective area is offered. This could even lead to an additional one in certain applications

Check valve or a pressure relief valve unit is made redundant, as shown for example in Fig. 6.

LIST OF REFERENCE NUMBERS

10 silencers

12 housing

14 housing cover

16 housing exterior pot

18 housing insert / housing upper part

20 neck nozzle

22 air intake

24 inflow tunnel

26 guide ribs

28 pressure relief valve unit

30 housing receptacle

32 overpressure valve opening

34 ball

36 spring

38 use

40 relief valve outlet

42 cup-shaped approach

44 collar

46 air outlet openings

48 labyrinthine insulation structure

50 housing base ribs

52 housing top ribs

54 air outlets

1 10 silencer

1 16 housing pot

1 16a housing base

1 16b guide

1 16c overpressure air outlet openings

122 air intake

123 coarse strainer 124 inflow tunnel

128 pressure relief valve unit

130 leadership

130a overpressure air outlet openings 142 intermediate channel

150 lower housing ribs

154 air outlets

210 silencer

216 housing pot

216a guide

222 air intake

223 nozzle-like structure

228 overpressure valve unit

242 intermediate channel

250 housing base ribs

310 silencer

314 housing cover

322 air intake

323 nozzle-like structure

328 overpressure valve unit

328a pressure relief valve neck

328b outlet openings

328c rubber cuff

342 intermediate channel

410 silencer

422 air intake

428 overpressure valve unit

442 intermediate channel

510 silencer jet

Intermediate duct insulation

Noise damper nozzle

Intermediate duct insulation

Claims

1 . Noise damper (10) for a compressed air system of a vehicle, in particular a commercial vehicle, with a housing (12), with at least one air inlet (22) and with at least one air outlet (54) and with a labyrinthine insulating structure (48) arranged in the housing (12).

2. noise damper (10) according to claim 1,

characterized in that

the air inlet (22) is arranged axially and the air outlet (54) is arranged radially relative to the longitudinal axis of the housing (12).

3. silencer (10) according to claim 1 or claim 2,

characterized in that

the housing (12) is formed at least in two parts with at least one housing upper part (18) and with at least one lower housing part.

4. noise damper (10) according to claim 3,

characterized in that

the housing upper part (18) has at least one substantially completely radially encircling housing upper rib (52) and that the lower housing part has at least one substantially completely radially encircling lower housing rib (50).

5. noise damper (10) according to claim 4,

characterized in that

the housing upper rib (52) and the lower housing rib (50) are arranged radially offset from each other.

6. silencer (10) according to claim 4 or claim 5,

characterized in that

the housing upper rib (52) and the lower housing rib (50) at least partially form the labyrinthine insulating structure (48).

7. silencer (10) according to any one of claims 3 to 6,

characterized in that

the upper housing part (18) and the lower housing part interlock.

8. silencer (10) according to any one of the preceding claims,

characterized in that

a pressure relief valve unit (28) is provided.

9. silencer (10) according to claim 8,

characterized in that

an inlet side, an inflow space (24) is provided and that the pressure relief valve unit (28), the air inlet (22) and the labyrinthine Dämmstruktur (48) with the

Inflow space (24) are connected.